libavformat/lxfdec.c File Reference

#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "riff.h"

Go to the source code of this file.

Data Structures
struct	LXFDemuxContext
Defines
#define	LXF_PACKET_HEADER_SIZE   60
#define	LXF_HEADER_DATA_SIZE   120
#define	LXF_IDENT   "LEITCH\0"
#define	LXF_IDENT_LENGTH   8
#define	LXF_SAMPLERATE   48000
#define	LXF_MAX_AUDIO_PACKET   (8008*15*4)
	15-channel 32-bit NTSC audio frame
Functions
static int	lxf_probe (AVProbeData *p)
static int	check_checksum (const uint8_t *header)
	Verify the checksum of an LXF packet header.
static int	sync (AVFormatContext *s, uint8_t *header)
	Read input until we find the next ident.
static int	get_packet_header (AVFormatContext *s, uint8_t *header, uint32_t *format)
	Read and checksum the next packet header.
static int	lxf_read_header (AVFormatContext *s, AVFormatParameters *ap)
static void	deplanarize (LXFDemuxContext *lxf, AVStream *ast, uint8_t *out, int bytes)
	De-planerize the PCM data in lxf->temp FIXME: remove this once support for planar audio is added to libavcodec.
static int	lxf_read_packet (AVFormatContext *s, AVPacket *pkt)
Variables
static const AVCodecTag	lxf_tags []
AVInputFormat	ff_lxf_demuxer

---

Define Documentation

#define LXF_HEADER_DATA_SIZE   120

Definition at line 27 of file lxfdec.c.

Referenced by lxf_read_header().

#define LXF_IDENT   "LEITCH\0"

Definition at line 28 of file lxfdec.c.

Referenced by lxf_probe(), and sync().

#define LXF_IDENT_LENGTH   8

Definition at line 29 of file lxfdec.c.

Referenced by get_packet_header(), lxf_probe(), and sync().

#define LXF_MAX_AUDIO_PACKET   (8008*15*4)

15-channel 32-bit NTSC audio frame

Definition at line 31 of file lxfdec.c.

Referenced by lxf_read_packet().

#define LXF_PACKET_HEADER_SIZE   60

Definition at line 26 of file lxfdec.c.

Referenced by check_checksum(), get_packet_header(), lxf_read_header(), and lxf_read_packet().

#define LXF_SAMPLERATE   48000

Definition at line 30 of file lxfdec.c.

Referenced by get_packet_header(), and lxf_read_header().

---

Function Documentation

static int check_checksum

(

const uint8_t *

header

)

[static]

Verify the checksum of an LXF packet header.

Parameters:

[in]

header

the packet header to check

Returns:

zero if the checksum is OK, non-zero otherwise

Definition at line 67 of file lxfdec.c.

Referenced by get_packet_header().

static void deplanarize	(	LXFDemuxContext *	lxf,
		AVStream *	ast,
		uint8_t *	out,
		int	bytes
	)			[static]

De-planerize the PCM data in lxf->temp FIXME: remove this once support for planar audio is added to libavcodec.

Parameters:

[out]	out	where to write the de-planerized data to
[in]	bytes	the total size of the PCM data

Definition at line 271 of file lxfdec.c.

Referenced by lxf_read_packet().

static int get_packet_header	(	AVFormatContext *	s,
		uint8_t *	header,
		uint32_t *	format
	)			[static]

Read and checksum the next packet header.

Parameters:

[out]	header	the read packet header
[out]	format	context dependent format information

Returns:

the size of the payload following the header or < 0 on failure

Definition at line 112 of file lxfdec.c.

Referenced by lxf_read_header(), and lxf_read_packet().

static int lxf_probe

(

AVProbeData *

p

)

[static]

Definition at line 53 of file lxfdec.c.

static int lxf_read_header	(	AVFormatContext *	s,
		AVFormatParameters *	ap
	)			[static]

Definition at line 198 of file lxfdec.c.

static int lxf_read_packet	(	AVFormatContext *	s,
		AVPacket *	pkt
	)			[static]

Definition at line 281 of file lxfdec.c.

static int sync	(	AVFormatContext *	s,
		uint8_t *	header
	)			[static]

Read input until we find the next ident.

If found, copy it to the header buffer

Parameters:

[out]

header

where to copy the ident to

Returns:

0 if an ident was found, < 0 on I/O error

Definition at line 84 of file lxfdec.c.

Referenced by avi_read_packet(), ff_gen_syncpoint_search(), get_packet_header(), ogg_read_page(), rm_read_dts(), and rm_read_packet().

---

Variable Documentation

AVInputFormat ff_lxf_demuxer

Initial value:

 {
    .name           = "lxf",
    .long_name      = NULL_IF_CONFIG_SMALL("VR native stream format (LXF)"),
    .priv_data_size = sizeof(LXFDemuxContext),
    .read_probe     = lxf_probe,
    .read_header    = lxf_read_header,
    .read_packet    = lxf_read_packet,
    .codec_tag      = (const AVCodecTag* const []){lxf_tags, 0},
}

Definition at line 339 of file lxfdec.c.

const AVCodecTag lxf_tags[] [static]

Initial value:

 {
    { CODEC_ID_MJPEG,       0 },
    { CODEC_ID_MPEG1VIDEO,  1 },
    { CODEC_ID_MPEG2VIDEO,  2 },    
    { CODEC_ID_MPEG2VIDEO,  3 },    
    { CODEC_ID_DVVIDEO,     4 },    
    { CODEC_ID_DVVIDEO,     5 },    
    { CODEC_ID_DVVIDEO,     6 },    
    { CODEC_ID_RAWVIDEO,    7 },    
    { CODEC_ID_RAWVIDEO,    8 },    
    { CODEC_ID_MPEG2VIDEO,  9 },    
    { CODEC_ID_NONE,        0 },
}

Definition at line 33 of file lxfdec.c.